kernel/fs/zfs/common/zfeature_common.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
  24  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  25  * Copyright (c) 2013, Joyent, Inc. All rights reserved.
  26  * Copyright (c) 2014 Integros [integros.com]
  27  */
  28
  29 #ifndef _ZFEATURE_COMMON_H
  30 #define _ZFEATURE_COMMON_H
  31
  32 #include <sys/fs/zfs.h>
  33 #include <sys/inttypes.h>
  34 #include <sys/types.h>
  35
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 struct zfeature_info;
  41
  42 typedef enum spa_feature {
  43         SPA_FEATURE_NONE = -1,
  44         SPA_FEATURE_ASYNC_DESTROY,
  45         SPA_FEATURE_EMPTY_BPOBJ,
  46         SPA_FEATURE_LZ4_COMPRESS,
  47         SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
  48         SPA_FEATURE_SPACEMAP_HISTOGRAM,
  49         SPA_FEATURE_ENABLED_TXG,
  50         SPA_FEATURE_HOLE_BIRTH,
  51         SPA_FEATURE_EXTENSIBLE_DATASET,
  52         SPA_FEATURE_EMBEDDED_DATA,
  53         SPA_FEATURE_BOOKMARKS,
  54         SPA_FEATURE_FS_SS_LIMIT,
  55         SPA_FEATURE_LARGE_BLOCKS,
  56         SPA_FEATURE_SHA512,
  57         SPA_FEATURE_SKEIN,
  58         SPA_FEATURE_EDONR,
  59         SPA_FEATURE_DEVICE_REMOVAL,
  60         SPA_FEATURE_OBSOLETE_COUNTS,
  61         SPA_FEATURES
  62 } spa_feature_t;
  63
  64 #define SPA_FEATURE_DISABLED    (-1ULL)
  65
  66 typedef enum zfeature_flags {
  67         /* Can open pool readonly even if this feature is not supported. */
  68         ZFEATURE_FLAG_READONLY_COMPAT =         (1 << 0),
  69         /* Is this feature necessary to read the MOS? */
  70         ZFEATURE_FLAG_MOS =                     (1 << 1),
  71         /* Activate this feature at the same time it is enabled. */
  72         ZFEATURE_FLAG_ACTIVATE_ON_ENABLE =      (1 << 2),
  73         /* Each dataset has a field set if it has ever used this feature. */
  74         ZFEATURE_FLAG_PER_DATASET =             (1 << 3)
  75 } zfeature_flags_t;
  76
  77 typedef struct zfeature_info {
  78         spa_feature_t fi_feature;
  79         const char *fi_uname;   /* User-facing feature name */
  80         const char *fi_guid;    /* On-disk feature identifier */
  81         const char *fi_desc;    /* Feature description */
  82         zfeature_flags_t fi_flags;
  83         /* array of dependencies, terminated by SPA_FEATURE_NONE */
  84         const spa_feature_t *fi_depends;
  85 } zfeature_info_t;
  86
  87 typedef int (zfeature_func_t)(zfeature_info_t *, void *);
  88
  89 #define ZFS_FEATURE_DEBUG
  90
  91 extern zfeature_info_t spa_feature_table[SPA_FEATURES];
  92
  93 extern boolean_t zfeature_is_valid_guid(const char *);
  94
  95 extern boolean_t zfeature_is_supported(const char *);
  96 extern int zfeature_lookup_name(const char *, spa_feature_t *);
  97 extern boolean_t zfeature_depends_on(spa_feature_t, spa_feature_t);
  98
  99 extern void zpool_feature_init(void);
 100
 101 #ifdef  __cplusplus
 102 }
 103 #endif
 104
 105 #endif  /* _ZFEATURE_COMMON_H */